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What Molecules Make the Holes in Bread?
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In this activity, learners will discover why there are holes in bread.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-767.jpg?itok=FfpXEwTl)
Forensic Science: Hair Sample Investigation
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This activity (on page 2 of the PDF under SciGirls Activity: Forensics) is a full inquiry investigation into how hairs from a crime scene are matched to suspects.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-000-212.jpg?itok=Kud6FGrr)
Bee Hummer
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In this activity, learners investigate sound and vibration by making a "bee hummer"--a toy that sounds like a swarm of buzzing bees when you spin it around.
Mission Insignia
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In this science/art activity, learners create an insignia or emblem for a planet exploration mission.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-840.gif?itok=3OcQsasE)
Motor Effect
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In this activity about electricity and magnetism, learners examine what happens when a magnet exerts a force on a current-carrying wire.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-850.png?itok=oZ7pQa_G)
The Menu Game at the Terribly Terrific Taco
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In this math game (Page 15 of the Dining Out! PDF), learners figure discounts and/or profit increases for various food totals. Learners add decimals to $100.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-570.gif?itok=0bFvmKdA)
Glow Up
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In this activity, learners explore chemiluminescence and fluorescence. Learners examine 3 different solutions in regular light, in the dark with added bleach solution, and under a black light.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-672.jpg?itok=yfW3qoNq)
Corner Reflector
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In this optics/mathematics activity, learners use two hinged mirrors to create a kaleidoscope that shows multiple images of an object.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-475.png?itok=Nw7b7i8_)
Parasite Sleuth
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In this activity (on pages 26-33), learners play parasitologists, solving several "mysteries" about people who got sick from various parasites. In teams of four, each member solves one mystery.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-841.jpg?itok=gl8lBbgk)
Bird in the Cage
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In this activity about afterimages, learners explore what happens when receptor cells called cones in your eye's retina get tired.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-673.jpg?itok=u5IzswvR)
Convection Current
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In this activity, learners make their own heat waves in an aquarium.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-005-169.jpg?itok=b5Kk1dJC)
Creating Craters
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In this activity, learners will investigate how craters are made and the different factors that contribute to size left from the impact.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-391.jpg?itok=r2OzSuPj)
Kid Moon: Splat!
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In this activity, learners model ancient lunar impacts using water balloons.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-384.png?itok=dS47xcy8)
Moon's Long History: Impact Paintings
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In this activity, pairs of learners model how scientists use craters to determine the ages of lunar surfaces. One partner keeps time while the other creates a painting for the other to interpret.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-000-978.png?itok=km7rCVvM)
Self-Portrait Silhouettes: Activity 2
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In this activity, learners make a photographic image—without a camera!
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-502.jpg?itok=g7gVRAfm)
The Great Plankton Race
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In this activity, learners are challenged to design a planktonic organism that will neither float like a cork nor sink like a stone.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-516.jpg?itok=OohLFBP-)
Exploring Size: Scented Balloons
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In this activity, learners use their sense of smell to explore the world on the nanoscale.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-768.jpg?itok=hG9dX_mh)
Strong Bones, Weak Bones
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Most people will break a bone in their body at some point in their life, but how much force does it take to break one?
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-611.jpg?itok=nDKIhSrT)
Animal Scent
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This activity (on page 3 of the PDF under GPS: Animal Scent Activity) is a full inquiry investigation into animal behavior.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-072.jpg?itok=U5YZF-ko)
Coupled Resonant Pendulums
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In this activity, learners discover that two pendulums suspended from a common support will swing back and forth in intriguing patterns, if the support allows the motion of one pendulum to influence t